The Siemens 7KM2200-2EA30-1DA1 is a SENTRON PAC2200 energy meter for 3-phase low-voltage systems up to 400 V. It uses indirect current measurement via external x/5 A current transformers, is self-powered from the measured voltage, and communicates via Modbus RTU over RS-485 — the most widely supported industrial serial protocol for energy and process data.

Modbus RTU: Universal Industrial Compatibility

Modbus RTU over RS-485 is the established standard for multi-drop serial communication in industrial environments. The 7KM2200-2EA30-1DA1 connects directly to existing PLC serial ports, RTU outstations, and protocol converters without requiring Ethernet infrastructure at the metering point. This is the right choice for retrofit installations, remote feeder panels, and facilities where the serial communication backbone is already in place.

Within the PAC2200 Family

Among the four PAC2200 communication variants, the 1DA1 (Modbus RTU) is the traditional industrial choice — where the 1CA1 (M-Bus) targets building automation metering buses, the 1EA1 (Modbus TCP) targets Ethernet-enabled control systems, and the 1JB1 (CLP) adds legal-for-trade billing certification on top of Modbus TCP. The 1DA1 delivers the same core measurement capabilities — active, reactive, and apparent energy and power — over the most universally compatible protocol.

Decision Parameters